Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad45d328610b6f93…

MALICIOUS

PDF

45.0 KB Created: 2021-05-11 22:10:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 90a1a339d2ae7884378fc8ae905667c0 SHA-1: bdb25faa08534b6d5ef257c39a2d281dfdf65205 SHA-256: ad45d328610b6f933bc712b4a0502db6144d9328040b318a96b32b969a047aa6
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'generators'. The primary link, https://netcdn.xyz/app/406889139/coins-master-hacks-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering lure to drive-by downloads or further malicious sites, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.xyz/app/406889139/coins-master-hacks-game-hack In PDF document text
    • http://firstaidacademy.be/images/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/robux-today_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/mangocheats-com-hack-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/se-puede-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/robux-fun-hack_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/free-robux-mod_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/coin-master-200-spin-link_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/free-games-like-coin-master_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/play-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://firstaidacademy.be/images/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://firstaidacademy.be/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004936.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4936 25564 bytes
SHA-256: 4fe1ff99c01bac26af0335b3de2530114bdfa6a9c8a2c55db22f15eef720e514
font_01_sfnt_off000083e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83E2 3400 bytes
SHA-256: 4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07
font_02_sfnt_off00008f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F0C 17716 bytes
SHA-256: d488acdeac9c101f8c7dc9d2f61752a744fbde28c1faa2289984f0ec4d4cc76f

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